The function of a hammer drill

Drilling as a physical movement in itself is a rotation. The helical drill grooves provide a "seizure" into the drilling substance. Axial pressure forces accelerate penetration. For solid and hard drilling substances such as concrete and stone, short and powerful "knocking" of the hammer as it moves forward will help.

Three power generation variants

A hammer drill is manufactured in three different drive types. In the DIY sector electrically and pneumatically driven striking mechanisms are selectable. In the professional high-performance sector such as mining, the function of compressed air in pneumatic systems is handled by hydraulically acting liquids.

Since steel reinforcements can often be encountered during drilling in Baubeton, gearbox adjustments with regard to the force distribution in high-quality rotary hammers are possible.

Drill and power transmission

Unlike a percussion drill, the drill moves in the chuck. He picks up the power of the percussion directly in his own movements. In a percussion drill, the firmly locked drill bit, in cooperation with the drill chuck, takes over the impact force of the impact mechanism.

A rotary hammer applies blows to the drill shaft. The force is generated in a piston by compression and triggers the firing pin. The drive bearing or an eccentric derives the anyway existing rotational energy of the engine in the required forward and backward movements.

striking mechanism

The impact mechanism of a hammer drill exceeds the performance of a drill mainly by the direct power transmission to the drill. Engine and leverage "lose" less energy to the point of pressure at the bit. The performance of the spring percussion or the pneumatic percussion works free of collateral damage.

When a hammer drill is used to penetrate concrete, the force is similar to a woodpecker clamped in a fan. When drilled in concrete using a percussion drill, the force transmission can be compared to the repeated manual application of a mixer bar to the drill site.

Tips & Tricks

If you're wondering if you'd better use a percussion drill or a hammer drill, the amount of work will be the most important. For usual household bores in concrete or stone a percussion drill is usually sufficient, which, however, requires significantly greater muscle power and can reach its performance limits with particularly stable drilling substances.

Video Board: Drill vs Impact Driver vs Hammer Drill